python - 在线程中调用 pack_forget()

Question

我有一个看起来像这样的 Python 程序

from tkinter import *
import threading, time
def cancel ():
    print ("Stop!")
def thread ():
    threading.Thread (target = new).start ()
def new ():
    b.pack_forget ()
    c = Canvas (root, width = 200, height = 25, bg = "white")
    c.pack ()
    Button (root, text = "OK", command = root.destroy).pack ()
    try:
        for x in range (200):
            time.sleep (0.02)
            c.create_rectangle ((x, 2, x + 1, 26), outline = "green", fill = "green")
        root.destroy ()
    except: pass
root = Tk ()
root.title ("Threading")
b = Button (root, text = "Begin.", command = thread)
b.pack ()
root.mainloop ()

但是，每次调用 pack_forget () 时它都会崩溃。我知道我可以这样做:

from tkinter import *
import threading, time
def cancel ():
    print ("Stop!")
def thread ():
    b.pack_forget ()
    threading.Thread (target = new).start ()
def new ():
    c = Canvas (root, width = 200, height = 25, bg = "white")
    c.pack ()
    Button (root, text = "OK", command = root.destroy).pack ()
    try:
        for x in range (200):
            time.sleep (0.02)
            c.create_rectangle ((x, 2, x + 1, 26), outline = "green", fill = "green")
        root.destroy ()
    except: pass
root = Tk ()
root.title ("Threading")
b = Button (root, text = "Begin.", command = thread)
b.pack ()
root.mainloop ()

但是，对于其他程序，是否可以在线程中调用 pack_forget。谢谢。

Answer 1

您不能从创建 GUI 的线程以外的线程调用 tkinter 函数。您需要设置一个线程安全的队列，并从工作线程向队列放置一些东西。主线程可以轮询这个队列并响应数据。

例如，您可以将像"pack_forget" 这样简单的内容放入队列中，当主程序从队列中取出字符串"pack_forget" 时，它知道调用该函数。